如何修复Python函数以遍历目录中的JSON文件列表并合并到单个JSON文件中

import os
import json

def merge_json_files(directory, output_file):
    json_data = []
    
    # 遍历目录中的所有文件和子目录
    for root, dirs, files in os.walk(directory):
        for file in files:
            if file.endswith(".json"):
                file_path = os.path.join(root, file)
                
                # 读取JSON文件内容
                with open(file_path, 'r') as f:
                    try:
                        data = json.load(f)
                        json_data.append(data)
                    except json.JSONDecodeError:
                        print(f"Error decoding JSON file: {file_path}")
    
    # 合并所有JSON数据
    merged_data = {}
    for data in json_data:
        merged_data.update(data)
    
    # 将合并后的数据写入单个JSON文件
    with open(output_file, 'w') as f:
        json.dump(merged_data, f, indent=4)
    
    print(f"JSON files merged successfully into {output_file}")

# 示例用法
merge_json_files('/path/to/directory', '/path/to/output.json')